1917 Jan 5. Gets a US Passport at US Embassy in London. He intends to return to USA but is living in UK

1917 Aug 7. Became a naturalised UK citizen. He was an Engineer, War Office Aeronautical
Inspection Dept. Living at 16, Fairmount Road, Brixton Hill, London

The UK National Archives shows the growth of the Department from 13 staff in December 1913 to 10,600 by 11 November 1918. The range of responsibilities was extensive, as illustrated by the following statement from the NA:

The scope of the inspection carried out by AID comprised not only aircraft but supplies of many other kinds utilized by the Flying Service, such as balloons, hangars, tents, machine tools, raw materials, fabrics and a variety of general equipment. In the inspection of these multifarious supplies almost every trade was dealt with, and some idea may be formed of the department's technical requirements when it is realized that detailed inspection was made of all materials, of the manufacturing process to which they were subjected, of the assembly of various parts into component units and of the erection of the aircraft, engines, etc.

When AID was the 'Aeronautical Inspection Department' it was under the control of the War Office, so personnel probably had to have a 'military rank' to have 'authority' on military installations. However, in March 1917 AID came under the control of the Ministry of Munitions and became the 'Aeronautical Inspection Directorate', so not 'military' but they may have continued with 'honorary ranks'. By the end of the war it had a total of 10,657 personnel of all grades of both sexes. The female element consisted of eight inspectors, 535 examiners, 4,274 viewers and some 500 office staff, that was up from zero in 1914.